This disclosure relates to a continuous solution polymerization process wherein production rate is increased. Process solvent, ethylene, optional comonomers, optional hydrogen and a single site catalyst formulation are injected into a first reactor forming a first ethylene interpolymer. Process solvent, ethylene, optional comonomers, optional hydrogen and a heterogeneous catalyst formulation are injected into a second reactor forming a second ethylene interpolymer. The first and second reactors may be configured in series or parallel modes of operation. Optionally, a third ethylene interpolymer is formed in an optional third reactor, wherein an optional heterogeneous catalyst formulation may be employed. In a solution phase, the first, second and optional third ethylene interpolymers are combined, the catalyst is deactivated, the solution is passivated and following a phase separation process an ethylene interpolymer product is recovered.

A process for the preparation of graphene, graphene materials, graphene oxide or reduced graphene oxide and the preparation of graphene, graphene materials, graphene oxide or reduced graphene oxide integrated in a thermoplastic and/or elastomeric polymer or polymer mixture by the effect of friction is produced by kneading, e.g., in an internal mixer with closed chamber or open chamber system, that performs the exfoliation of graphite, graphite oxide or reduced graphite oxide.

This disclosure relates to a continuous solution polymerization process where ethylene interpolymer products having an improved color index; for example, products having higher whiteness (Whiteness Index (WI)) and lower yellowness (Yellowness Index (YI)). Product color was improved by adjusting selected solution polymerization reaction conditions. The disclosed ethylene interpolymer products have improved color relative to comparative polyethylene compositions.

A method and composition of making polymer products from thermoplastic polymers by melt processing. Cross-linked polyethylene are mixed with at least one thermoplastic matrix polymer to form a polymer composition which is melt-processed. The cross-linked polyethylene is formed by a finely divided powder with particles having a screened size of less than 600 μm and a D.sub.50 of 200 to 400 μm. Cross-linked polyolefin can be used in a cost-effective and simple manner so that products generally considered a waste, such as scrapped cross-linked polyethylene pipes or unused cross-linked polyethylene discarded in e.g. pipe making processes, can be recycled and used as a starting material for polymer products.

A process of manufacturing a free-flowing solid encapsulated drag reducing additive comprises: forming a solid drag reducing additive from one or more C.sub.5-20 olefin monomers; dispersing the solid drag reducing additive in a liquid medium to form a dispersion, the liquid medium comprising an encapsulant and a non-solvent; grinding the solid drag reducing additive in the liquid medium under non-cryogenic grinding conditions to form an encapsulated drag reducing additive in a particulate form; and removing the non-solvent by a drying technique including spray drying, flash drying, or rotating disc drying to form the free-flowing solid encapsulated drag reducing additive.

This invention describes a low-cost, lightweight, high-performance composite bipolar plate for fuel cell applications. The composite bipolar plate can be produced using stamped or pressed into the final form including flow channels and other structures prior to curing.

The present invention provides a crosslinked molded article having a lower compression set; and a method for producing a crosslinked molded article by injection molding, the method enabling shortening of one cycle in injection molding, the method being suitable for obtaining a crosslinked molded article having a lower compression set. The present invention relates to a method for producing a crosslinked molded article, comprising melt-kneading a polymer composition containing a polymer having a terminal double bond, a hydrosilyl group-containing compound (Y) having at least two hydrosilyl groups per molecule, a platinum-based catalyst (Z) for hydrosilicon crosslinking, and a reaction inhibitor (D), subjecting the polymer composition to injection molding in a mold, performing primary crosslinking in the mold, removing the primary-crosslinked molded article from the mold, and then performing secondary crosslinking in a heat medium.

Catalyst compositions containing a metallocene compound, a solid activator, and a co-catalyst, in which the solid activator or the supported metallocene catalyst has a d50 average particle size of 15 to 50 μm and a particle size distribution of 0.5 to 1.5, can be contacted with an olefin in a loop slurry reactor to produce an olefin polymer. A representative ethylene-based polymer produced using the catalyst composition has excellent dart impact strength and low gels, and can be characterized by a HLMI from 4 to 10 g/10 min, a density from 0.944 to 0.955 g/cm.sup.3, a higher molecular weight component with a Mn from 280,000 to 440,000 g/mol, and a lower molecular weight component with a Mw from 30,000 to 45,000 g/mol and a ratio of Mz/Mw ranging from 2.3 to 3.4.

Disclosed are biaxially stretched polyolefin films containing a) 10 to 45% by weight of a cycloolefin polymer with a glass transition temperature between 120 and 170° C., and b) 90 to 55% by weight of a semi-crystalline alpha-olefin polymer with a crystallite melting temperature between 150 and 170° C., wherein the glass transition temperature of component a) being less than or equal to the crystallite melting temperature of component b), and wherein the polyolefin film has a shrinkage at 130° C. after 5 minutes, as measured according to ISO 11501, of less than or equal to 2%.

These polyolefin films are excellent suited as dielectrics for capacitors but also for other applications and are distinguished by a low shrinkage at high temperatures.

A porous polyolefin film has a shutdown temperature of 133° C. or lower, a porosity of 41% or more, and a value of 12,500 or more, which is calculated by (tensile elongation (%) in the machine direction (MD)×tensile strength (MPa) in the machine direction (MD)+tensile elongation (%) in the transverse direction (TD)×tensile strength (MPa) in the transverse direction (TD))/2, the TSD (° C.) and Tm satisfying formula (1):

Tm−TSD≥0   (1),

where TSD represents the shutdown temperature (° C.), and Tm represents the lowest among the melting point (° C.) of all layers, wherein excellent safety such as protection from internal short circuit and/or thermal runaway is achieved in the porous polyolefin film, without reducing the permeability as shown in conventional microporous films.